Antenna
Encyclopedia
Antenna (pl. antennas in radio/TV, antennae in biology) may refer to:
Science and engineering
- Antenna (radio)Antenna (radio)An antenna is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver...
, also known as an aerial, a transducer designed to transmit or receive electromagnetic (e.g. TV or radio) waves- Television antennaTelevision antennaA television antenna, or TV aerial, is an antenna specifically designed for the reception of over the air broadcast television signals, which are transmitted at frequencies from about 41 to 250 MHz in the VHF band, and 470 to 960 MHz in the UHF band in different countries...
(or TV aerial), is an antenna specifically designed for the reception of broadcast television signals
- Television antenna
- Antennae GalaxiesAntennae GalaxiesThe Antennae Galaxies are a pair of interacting galaxies in the constellation Corvus. They are currently going through a phase of starburst. They were discovered by William Herschel in 1785...
, the name of two colliding galaxies NGC 4038 and NGC 4039
Technology
- Antenna tower, typically a tall structure designed to support antennas (also known as aerials in the UK) for telecommunications and broadcasting, including television
- Antenna arrayAntenna arrayAntenna array may refer to:*Antenna array a group of isotropic radiators such that the currents running through them are of different amplitudes and phases*Interferometric array of radio telescopes used in radio astronomy...
, a collection of simple antennas (called elements) arranged normally in a rectangular of circular configuration and connected together by a complex feed system which may be constructed of cable, waveguide, stripline of microstrip components, connected together in such a way (phased) as to produce a directional beam (called the main beam). The array feed system typically is designed to suppress radiation in unwanted directions (sidelobes) by various highly mathematical design methods (often, but not always, related to the Taylor or Tchebycheff polynomials) A Phased Array is an antenna array capable of steering its directional beam in one or more directions without any moving (mechanical) parts. The beam's movement is accomplished by introducing electrical components called phase shifters into the feed system that connects to the individual antenna elements that make up the face of the array. - Dipole antennaDipole antennaA dipole antenna is a radio antenna that can be made of a simple wire, with a center-fed driven element. It consists of two metal conductors of rod or wire, oriented parallel and collinear with each other , with a small space between them. The radio frequency voltage is applied to the antenna at...
, a simple antenna usually constructed from two wires in opposite phases (180 degrees out of phase) placed end to end (with a small space in between) and whose total length approximates one half the wavelength of the RF energy it is designed to radiate, but which can be constructed from one longer wire folded in such a way that length and phase relationships are maintained so as to maximize radiation from the antenna. The dipole is fed at its input by an appropriate source of RF energy. - Directional antennaDirectional antennaA directional antenna or beam antenna is an antenna which radiates greater power in one or more directions allowing for increased performance on transmit and receive and reduced interference from unwanted sources....
, or beam antenna, radiates greater power primarily in one direction, with radiation in other directions (called sidelobes) usually suppressed by various design methods. - Horn antennaHorn antennaA horn antenna or microwave horn is an antenna that consists of a flaring metal waveguide shaped like a horn to direct the radio waves. Horns are widely used as antennas at UHF and microwave frequencies, above 300 MHz...
, a type of directional antenna shaped like horn, usually, but not always, with a rectangular face, dimensioned to produce a directional beam of a narrowly varying angular width over a limited frequency range. - Metamaterial antenna, a class of antenna incorporating metamaterials to increase performance of a miniaturized (electrically small) antenna systems
- Omnidirectional antennaOmnidirectional antennaIn radio communication, an omnidirectional antenna is an antenna which radiates radio wave power uniformly in all directions in one plane, with the radiated power decreasing with elevation angle above or below the plane, dropping to zero on the antenna's axis. This radiation pattern is often...
, an antenna system which radiates power uniformly in all directions in one plane, typically the horizontal plane but possible in any plane. The energy level radiated from the antenna normally drops off gradually on both sides of the plane of omnidirectionality until it approaches zero at +/-ninety degrees away from the design plane. The beam shape is similar to that of a donut. - Parabolic antennaParabolic antennaA parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish...
, An antenna type generally used at microwave and millimeter wave frequencies but sometimes utilized at frequencies lower than one GHz, shaped like a parabola in one or both planes and fed by a smaller antenna system located near the parabolic focus. The feed antenna is often, but not always, complex and may be composed of more than one simple antenna (such as horns, dipoles or microstrip patches) connected together in order to improve the tracking ability or pointing accuracy of the system (the antenna itself plus ancillary transmitting and/or receiving equipment). Simple versions of this antenna type are used for radio, television and data communications. More complex versions are generally used for Radio Detection And Ranging (RADAR) and for direction finding applications. - Radio telescopeRadio telescopeA radio telescope is a form of directional radio antenna used in radio astronomy. The same types of antennas are also used in tracking and collecting data from satellites and space probes...
, a form of directional antenna, usually a parabolic antenna, but sometimes a large horn antenna, primarily used in radio astronomy but also used for tracking and collecting data from satellites and space probes.
Biology
- Antenna (biology)Antenna (biology)Antennae in biology have historically been paired appendages used for sensing in arthropods. More recently, the term has also been applied to cilium structures present in most cell types of eukaryotes....
, one of a pair of appendages used for sensing in arthropods; also applied to cilium structures present in most cell types of eukaryotes - Antenna (journal), the journal of the Royal Entomological Society
Entertainment
- Antenna (band)Antenna (band)Antenna was an American indie rock band active from 1991 to 1994.The group was put together in Bloomington, Indiana by John Strohm and Freda Love, who had previously played together in the group Blake Babies. After adding local musicians Jacob Smith and Vess Ruhtenberg to the lineup, they began...
, an American indie rock band active from 1991 to 1994, formed in Bloomington, Indiana by John Strohm and Freda Love - Antenna (Cave In album)Antenna (Cave In album)Antenna is the third studio album and first major label album by American rock band Cave In. Released in 2003, it marks Cave In's first and only album under RCA before being dropped and resigning fully with Hydra Head. Antenna marked a more commercial shift in Cave In's style which, while...
, the third studio album and first major label album by American rock band Cave In, released in 2003 - Antenna (GO!GO!7188 album)Antenna (GO!GO!7188 album)is the seventh studio album by Japanese rock band GO!GO!7188. The limited release first press also included a DVD featuring PV's for the single "Futashika Tashika" and a live performance, "Omata Kara no Live Eizou."-Track listing:...
, the seventh studio album by Japanese rock band GO!GO!7188, released in 2009 - Antenna (ZZ Top album), the eleventh studio album by American blues-rock band ZZ Top, released in 1994
- Antenna (film)Antenna (film)Antenna is a 1969 Dutch film directed by Adriaan Ditvoorst....
, a satirical 1969 Dutch film directed by Adriaan Ditvoorst - "Antenna", an episode of the Adult Swim animated television series, Aqua Teen Hunger ForceAqua Teen Hunger ForceAqua Teen Hunger Force , retitled Aqua Unit Patrol Squad 1 in 2011, is an American animated television series on Cartoon Network late night programing block, Adult Swim, as well as Teletoon's Teletoon at Night block and later G4 Canada's ADd block in Canada...
Broadcasting
- ANT1ANT1Antenna, better known as ANT1, is a television network airing in Greece and Cyprus. The alternate spelling is play on words in Greek; ena is the Greek number 1, thus ANT1 is pronounced the same as Antenna . It launched on 31 December 1989, the same year as rival Mega Channel, and is owned by...
, a Greek-language terrestrial channel - Antena Internaţional, a Romanian television channel
- Antena 1 (Romania), a Romanian television channel
- Antena 2 (Romania)Antena 2 (Romania)Antena 2 is a Romanian TV channel. It started broadcasting on April 9, 2007 and is part of the Intact group, owned by the family of the Romanian businessman and politician Dan Voiculescu.-External links:*...
, a Romanian television channel - Antena 3 (Romania)Antena 3 (Romania)Antena 3 is a Romanian TV channel, which focuses on news and current events. It was launched in May 2005 and is part of the Intact group. Antena 3 is also distributed in Serbia in the Romanian language-extra package of the DTH platform Digi TV...
, a Romanian television channel - Antena 3 (Spain)Antena 3 (Spain)Antena 3 is a Spanish terrestrial television channel owned by Antena 3 de Televisión. Some of the more popular programmes broadcast by Antena 3 include Aquí no hay quien viva, El Barco, Los Protegidos, Los Simpson and El Internado....
, a Spanish terrestrial television channel - Antenna TVAntenna TVAntenna TV is an American digital broadcast television network, primarily featuring classic television series from the 1950s to the 1990s, along with some feature films. It is owned by Tribune Broadcasting, a division of the Chicago-based Tribune Company...
, a U.S. television channel established in 2011 by Tribune Broadcasting - RDP Antena 1RDP Antena 1Antena 1 is one of the three national radio channels produced by the Portuguese public broadcasting entity Rádio e Televisão de Portugal, the others being Antena 2 and Antena 3....
, Portuguese public radio station - RDP Antena 2RDP Antena 2Antena 2 is one of the three national radio channels produced by the Portuguese public broadcasting entity Rádio e Televisão de Portugal, the others being Antena 1 and Antena 3....
, Portuguese public radio station - RDP Antena 3RDP Antena 3Antena 3 is one of the three national radio channels produced by the Portuguese public broadcasting entity Rádio e Televisão de Portugal, the others being Antena 1 and Antena 2....
, Portuguese public radio station